TRAFFIC CONTROL METHOD Russian patent published in 1994 - IPC

FIELD: automatics, mainly traffic control in city condition. SUBSTANCE: method comprises steps of receiving an inquiry RF-signal in a traffic light, arranged on a crossroads, being controlled, irradiating response US-signals; calculating at the crossroads motion speed of transport vehicles, being spaced by distances S₁...S_i...S_n, V_нi=S_i/t_н3 ; V_кi=S_i/t_к3, necessary for crossing the crossroads by respective transport vehicle at a time moment t_н3 of beginning and at a time moment t_к3 of termination of action of nearest in time allowing signal of the traffic light; comparing speed values V_нi и V_кi with admissible speed motion value V_g on a way portion before the crossroads; and, if V_нi < V_g and V_кi < V_g, selecting for the transport vehicles, being spaced by a distance S_i from the crossroads, respectively minimum and maximum speed values V_minci = V_кi and V_maxi = V_нi; if V_нi ≥ V_g and V_кi < V_g, then V_mini = V_кi and V_maxi= V_g; if V_нi ≥ V_g and V_кi ≥ V_g, then repeating calculation of speed values V_кi and V_нi and selection of V_maxci and V_mini for transport vehicles, spaced from the crossroads by a distance S_i, for time moments t_нз and t_кз , corresponding to next cycle (relative to a cycle, regarded beforehand) of the traffic light switching; irradiating from the traffic light RF-signals, carrying information about V_mini и V_maxci in time intervals τ_i = S_i/V_нз from a time moment of irradiation of response ultrasonic signal by the traffic light; receiving the response ultrasonic signals and the RF-signal, irradiated by the traffic light, by the transport vehicles; in transport vehicles taking off information, concentric V_mini and V_maxci, if time moments of reception of respective ultrasonic and RF-signals are the same; maintaining the speed motion of the transport vehicle, spaced by the distance S_i from the traffic light, in limits, restricted by V_mini and V_maxci. EFFECT: enhanced functional reliability of the method. 1 cl, 2 dwg